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annotate mem.c @ 832:0433fdd9ba66

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Added a command line option to force BlastEm to not open a new terminal even if it detects that stdin/out are not terminals
author Michael Pavone <pavone@retrodev.com>
date Mon, 19 Oct 2015 19:16:28 -0700
parents c3e3a0d734e2
children 9f149f0e98b7
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include <sys/mman.h>
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7 #include <stddef.h>
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <unistd.h>
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11 #include <errno.h>
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12 #include <stdio.h>
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14 #include "mem.h"
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15 #ifndef MAP_ANONYMOUS
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16 #define MAP_ANONYMOUS MAP_ANON
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17 #endif
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19 #ifndef MAP_32BIT
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20 #define MAP_32BIT 0
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21 #endif
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23 void * alloc_code(size_t *size)
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24 {
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25 //start at the 1GB mark to allow plenty of room for sbrk based malloc implementations
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26 //while still keeping well within 32-bit displacement range for calling code compiled into the executable
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27 static uint8_t *next = (uint8_t *)0x40000000;
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28 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
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29 uint8_t *ret = mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
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30 if (ret == MAP_FAILED) {
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31 perror("alloc_code");
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32 return NULL;
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33 }
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34 next = ret + *size;
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35 return ret;
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36 }
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